Optical Absorption and Photoluminescence (PL) Measurements: The LiPBO sample was prepared as a thin film on a quartz substrate by thermal evaporation at a rate of 0.2 /s at 5´10 ±6 torr. Optical absorption and PL spectra were measured by UV-vis spectrometry and IAE-PL-SYS-1 (Nanotech) equipped with a linear charge coupled device detector (Ocean Optics, S2000) and a Xenon lamp coupled with a monochromator. For the PL measurements, the excitation wavelength was fixed as 365 nm, with regard to the absorption spectrum.Fabrication and Characteristics of OELD: A 1:1 mixture of poly(ether imide) (PEI) and N,N¢-diphenyl-N,N¢-bis(3-methylphenyl)-[1,1¢-diphenyl]-4,4¢-diamine (TPD) were dissolved in chloroform to form a solution concentration of ca. 0.5 wt.-%. The solution was spun for ca. 1.5 min at 5000 rpm onto ITO glass, which had a seven-segment pattern on it, and subsequently dried at 110 C for ca. 1 h. The dried polyimide HTL film had a thickness of 375 as determined by a surface profiler (Tencor P-10). Next, LiPBO was thermally evaporated onto the polyimide HTL using a low-temperature effusion cell (EPI-30-M-LT). The evaporation rate, the temperature, the vacuum, and the film thickness were ca. 0.1 /s, 315 C, 5´10 ±6 torr, and 200 , respectively. A 3500 thick layer of Aluminum was deposited on the LiP-BO thin film by thermal evaporation at a rate of up to 5 /s. The evaporation rate and thickness were detected using a thickness monitor (Sycon Instruments STM-100/MF). The luminance±current density±voltage (L±J±V) characteristics of OELD were measured by IAE-OELD-SYS with an electrometer (Keithley 237), a calibrated photodiode, a diode array rapid scan analyzer (PSI DARSA-2000), and a candela meter (Minolta CS1000). The electroluminescent (EL) spectra were measured by a spectrophotometer (JOBIN-YVON-SPEX 270M) with a photomultiplier tube (PMT) as a detector and the IAE-PL-SYS-1 mentioned previously.The design of porous solids that can selectively and reversibly bind molecules has been the subject of much recent interest. [1] These highly specific interactions are critical in a range of important practical chemical technologies such as chemical sensing, [2±4] separations, [5] and catalysis [6] . The design of lamellar inorganic hosts such as clays, phosphates, phosphonates and modified thin films that exhibit molecular recognition features has recently been reviewed by Mallouk and Gavin. [7] In lamellar inorganic solids, guest molecules access intracrystalline binding sites via intercalation reactions. In most cases, inorganic intercalation reactions are unselective processes which are driven by either oxidation±reduction, ion-exchange, acid±base, or donor±acceptor reactions. The interlamellar gallery expands to accommodate the guest species resulting in little size-or shape-selectivity to the reaction. Here we report the use of a crystalline-ordered layered double hydroxide (LDH) that exhibits shape-selective intercalation. In addition, we have found that this remarkable shape selectivity can be controlled by alterin...